Grate for stoves and furnaces.



V. M. HAAS.

GRATE FOR STOVES AND FURNACES,

APPLICATION FILED IBB.13, 1913.

1,121 180. Patented Dec. 15, 1914.

2 SHEETS-SHEET 1 'izcerzififlaax INVENTOR,

I BY ATTORN EY VJ-M. HAAS.

GRATE FOR. STOVES AND FURNACES.

APPLICATION FILED FEB 1,121,180, Patented Deb.15,1914.

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INVENTOR WITNESSES TTTTTT EY 'rnn sra'rns PJEN orrio.

VINCENT M. HAAS, OF NORRISTOWN, PENNSYLVANIA, ASSIGNOR TO PYRAMID FIRE GRATE COMPANY, INC., 01? NORRISTOWN, PENNSYLVANIA, A CORPORATION OF DELAWARE.

GRATE FOR STOVES AND'FURNAGES.

Specification of Letters Patent.

Patented Dec. 15, 1914.

To all whom it may concern Be it known that I, VINCENT M. HAAS, a citizen of the United States, residing at Norristown, in the county of Montgomery and State of Pennsylvania, have invented a new and useful Grate for Stoves and Furnaces, of which the following is a specification.

The invention relates to improvements in grates.

The object of the present invention is to improve the construction of grates, and to provide a simple, inexpensive and efficient rotary roller bearing shaking grate, designed for use in stoves and in the furnaces of hot air steam and hot water heating systems, and equipped with means for reducing the area of the fire pot without lessening the size or capacity of the ring or wall of fire, which impinges against the interior of the casing of the stove or furnace, whereby the fire will be most advantageously placed for the distribution of heat, and practically the same heating effect will be obtained as with a fire pot of increased capacity and at the expenditure of a smaller amount of fuel.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated inthe accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings :Figure 1 is a vertical sectional view of a portion of a furnace equipped with a grate, constructed in accordance with this invention. Fig. 2 is a horizontal sectional view of the same.

or annular grate member. Fig. 4: is a plan view of the central section and support of the grate. Fig. 5 is a detail view of a portion of the fire pot cylinder. Fig. 6 is a detail sectional view, illustrating another form of the fire spreading cone. Fig. 7 is a detail sectional view on the line 77 of Fig. 2.

Like numerals of reference designate corresponding parts in all the figures of the drawings.

Fig. 7 3 1s a plan view of the rotary shaking ring 7 t In the accompanying drawings in which 18 illustrated the preferred embodiment of the invention, the grate comprises in its construction a support consisting preferably of a casting and composed of a central circular grate section 1 and integral radial supporting arms 2, connected at their inner ends with the central grate section at the periphery thereof and extending outwardly therefrom to the casing 3 of a furnace 4 and secured to an inwardly extending annular supporting flange 5 of a base 6 of the furnace by bolts 7, which pierce the ends of the arms 2 and the flange 5. The grate may, however, be applied to an ordinary heating stove, or to any other form of furnace, and the central grate section 1 is provided with a depending flange 8, and it has an annular series of spaced projections 9 forming intervening recesses 10 and arranged in flush relation with the upper face of the central grate section 1. The depending annular flange 8 downwardly offsets the radial supporting arms 2 from the plane of the upper face of the central grate section 1, and enables a rotary shaking ring 11, which is supported by the arms to be arranged in flush relation with the central grate section 1.

The rotary shaking ring constitutes an annular grate member and is provided at its inner and outer edges with spaced projections 12 and 13, forming intervening recesses 14c and 15, and it surrounds the central grate section 1 and is located in the space between the same and a fire'pot' cylinder 16. The ring. is also provided between its inner and outer edges with curved slots 15 spaced from each other and, separated by intervening solid portions of the shaking ring. IVhen the shaking rin is reversely rotated by an operating arm 1?, it is adapted to clean the grate of dust and ashes at the inner and outer edges and also at the'openings 15 The operatinglarm,

which extends through a slot or opening 18 v at the front of the furnace, is preferably provided with an inner threaded terminal 19, which screws into a threaded socket 20, formed in the lug at the front of the shaking ring 11. Any other suitable means, however, may be employed for partially rotating the shaking ring.

In order to enable the shaking ring to be easily vibrated or reversely rotated, it is upper portion 33 of the stem is threaded and so i th'e center of the base of the cone. The cone supported upon steel anti-friction balls 21, operating in arcuate ball races 22 and 23 of the support and the shaking ring. The support is provided at its radially arranged arms with curved lateral extensions 21, projecting from opposite sides of the arms and grooved at their upper faces to form the lower arcuate ball races 22, which are concentric with the center of the grate. The shaking ring is provided in its lower face with arcuate grooves 23, receiving the upper portions of the anti-friction balls, as clearly illustrated in Fig. 7 of the drawings. The curved grooves of the support and the shakingring permit free movement of the balls, and in order to prevent the grooves from becoming clogged with dust, the support is providedin the bottom of its grooves 22 with slots 26, extending longitudinally of the grooves 22 and curved to conform to the configuration of the same. The slots 26 permit the dust to drop through the lower grooves, and the movement of the anti-friction balls along the grooves will assist in cleaning the same.

The cylinder 16, which constitutes a llningfor the fire pot section of the furnace, is'provided 'atits lower edge w1th recesses 27 forming spaced lower portions,wl 11ch are located opposite the outer projections 13 of the shaking ring. The fire pot cylinder 16 issupported upon the inwardly extending annular flange 5 of the base 6, and the lower ends of the spaced supporting arms of the cylinder 16 are interposed be: tween the fire pot section of the casing of the-furnace and the outer ends of the radial arms 2. The fire'pot cylinder may-be of any desiredheight, and the scalloped or reces'sed lower edge or portion of the same cooperates with the ring 11 in the shaking action thereof.

Mounted upon the central section of the grate is a cone 28, preferably extendlng upwardly to the plane of the upper edge of'the fire pot cylinder 16, but it may be, of course, varied in hei'g'htand diameter to suit the character of stove or furnace in which it is designed to be used.- The cone has a fiat bs'Lse,which-fits against the upper face of the central grate section 1, and it is provided with a depending stem 29 extending through a central opening 30 in the grate section 1 and projecting below the same and provided with a slot 31 for the reception of a wedge-shaped key 32, or other suitable 'means for detachably securing the cone upon the central section of the grate. The

is-secured in a threaded bore or socket in 28 may be constructed of a single piece'of off units-of heat, or as illustrated in Fig.

6 of the drawings, it may be constructed of a body portion 34 of fire brick or similar material, having a metallic tip 35 to protect it and prevent it from being injured by the fuel thrown into a stove or'furnace. The metallic tip 35, which is conical, is formed integral with and is arranged at the upper end of a rod 36, extending through the body portion 34 of the cone and projecting below the same and provided in its lower depending portion with a slot or opening for the reception of a key '37, or other suitable fastening device for securing the cone to the central section of the grate.

It is a well known fact that the combustion in a stove is the greatest at the center of thefire pot, and as this central heat is not radiated to advantage, but passes off and out through the draft channels to the stove pipe, the greater portion of it is con- The cone, which fills the 7 sequently lost. central portion of the fire box, is adapted in a, great measure to prevent this loss, and When the cone is constructed of heavycast iron, it is constantly heated by the surrounding fire, and it is heated to such a degree that it throws off the heat units in the center of the fire-pot. The conealso distributes the fire in a ringaround the fire pot where it lmpmges against the interior of the stove or furnace casing'and 'whereit is adapted to radiate its heatto the greatest advantage. A r1ng of fire thus maintained in contact wlth the niterior of the furnace casing will be found practically as eflicient in the matter of house or building heating as a fire,

which completely covers the grate, and the decreased capacity of the fire pot'incident to the employment of the cone enables the wall of fire'to be maintained at the inner face of the casing at the expenditure of a considerably less amount vof fuel than is possible when the fire distributing cone is not employed. The grate is also especially adaptedfor climates where the temperature or weather is changeable, for when the weather'is mild Sa'low fire may be maintained by simply having a ringof fire at the base of the cone, and extremely cold weather, the fire may be maintained at the helght of'the'top of the cone, which will enable the fire to be easily adjusted or graduated to'suit Weather conditions.

What is claimed is 1. Av grate of the class described including a stationary central circular grate section having. peripheral projections and provided with outwardly extending supporting arms rigid with the said central grate section, said arms having'terminal attaching means for scurin'gTthem within a'stove or furnace for supporting the central circular grate section in afixed position, and a movable shaking ringsupported by the said arms and surrounding thecentral'section.- in

substantially flush relation with thepe'ripheral projections thereof and provided with means for coacting with the said projections.

2. A grate of the class described including a support consistingof a stationary central circular substantially horizontal grate section having peripheral projections and provided with outwardly extending supporting arms rigid with the central section, said supporting arms being downwardly offset from the plane of the peripheral projections and having means for rigidly securing them within a stove or furnace to support the central grate section in a fixed position a fire distributing cone seated upon and extending upwardly from the central grate section, and a movable shaking ring supported by the said armsand arranged in substantially flush relation with and surrounding the central grate section and having means for cooperating with the said peripheral projections.

3. A grate of the class described including a cylinder fire pot lining, a fixed support consisting of a circular imperforate grate section provided with peripheral proections, and supporting arms integral with and extending outwardly from the central a In testimony, that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

VINCENT M. HAAS. Witnesses;

ROY G. STEVENSON, S. R. DRENNING.

Copies 0! this patent may be obtained for five cents each, by addressing the Commissioner of Patentn,

Washington, I). 0. 

